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This year so far:

Thirupachi - Nee Entha Ooru
Ji - Vambu
Raam - Boom Boom

Years Past:
Kadhalan (all)
Mr Romeo - Romeo Attam
Love Birds - Sambha Sambha
Minsara Kanavu - Vennilave Vennilave
Thirumalai - Thamathaka
Gilli - Appadi Podu
Gentlemen - Chikku Bukku (changed choreography as we know it in tamil films today)
Boys - Saregame
12b - Love Pannu
Kadhal Konden - Thottu Thottu
KanduKonden x 2 - All songs
Thirudha Thirudha - Veerapandi Kottaiyilai
Indian - patriotic song
Alai Payuthey - Pachai Nirame
Aiyatha Ezhuthu - Yakkai Thiri & Jana Gana Mana
M.Kumaran - Chennai Senthamizh & First song in movie
Mounam Pesiyudhe - Adatha Attam

In my opinion as far as stars are concerned:
Prabhu Deva,Lawrence, Vijay, & Jayam Ravi are good to watch

As far as directors:
Mani Ratnam,Shankar, Rajiv Menon & Ameer take time with making their songs watchable